UA 4500 then CM 444 at Dulles
Detroit → Washington → Tocumen
Timetable, Washington time
21:17UA 4500 from Detroit at the gate
15:37CM 444 to Tocumen leaves the gate
18 h 20 apart on the timetable, overnight
CM 444 leaves 18 h 20 after UA 4500 arrives on the timetable: more than half a day, so not a connection we count.